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[Coq-Club] natural numbers as a datatype and as decimal numerals


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  • From: Gergely Buday <gbuday AT gmail.com>
  • To: coq-club AT inria.fr
  • Subject: [Coq-Club] natural numbers as a datatype and as decimal numerals
  • Date: Mon, 14 May 2018 10:34:01 +0200
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Hi,

in Software Foundations' first file, Basics.v, the file defines

Inductive nat : Type :=
| O : nat
| S : nat -> nat.

and then, magically, uses decimal numerals, 3, 5 and so on for it.

How does Coq relate the above user definition to the standard way of
writing natural numbers? I haven't seen any special declaration in the
file that tells the system to do so.

- Gergely



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